5 Result(s)
within
L. Svalgaard
Physics
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Article
Open AccessRecalibration of the Sunspot-Number: Status Report
We report progress on the ongoing recalibration of the Wolf sunspot number ( S N ...
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Article
Preface to Topical Issue: Recalibration of the Sunspot Number
This topical issue contains articles on the effort to recalibrate the sunspot number (SN) that was initiated by the Sunspot Number Workshops. These workshops led to a revision of the Wolf sunspot number (WSN) ...
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Article
A Revised Collection of Sunspot Group Numbers
We describe a revised collection of the number of sunspot groups from 1610 to the present. This new collection is based on the work of Hoyt and Schatten (Solar Phys. 179, 189, 1998). The main changes are the elim...
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Article
A Multi-Observatory Inter-Comparison of Line-of-Sight Synoptic Solar Magnetograms
The observed photospheric magnetic field is a crucial parameter for understanding a range of fundamental solar and heliospheric phenomena. Synoptic maps, in particular, which are derived from the observed line...
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Article
The 1859 Solar–Terrestrial Disturbance And the Current Limits of Extreme Space Weather Activity
It is generally appreciated that the September 1859 solar–terrestrial disturbance, the first recognized space weather event, was exceptionally large. How large and how exceptional? To answer these questions, w...
